As of Wednesday, January 21, 2026, we are currently experiencing system issues with the Shared Repository Service, including the Tsukuba Repository.

Depending on the timing of your access, you may encounter the following issues:

"502 Bad Gateway" error message

"400 Bad Request" error message

Extremely slow performance and delays in page transitions

If you experience any of these symptoms, please wait a while before attempting to browse or search again.

The system developer is currently working urgently to resolve the issue. We ask for your patience until the service is fully restored. We will post an update on this page as soon as the system is back online.

We sincerely apologize for any inconvenience this may cause to our users.